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### Volumes & Surfaces Areas :

Volumes & Surfaces Areas 3

2 2

### Slide 4:

Surface Area of Any Prism  (b is the shape of the ends) Surface Area = Lateral area + Area of two ends (Lateral area) = (perimeter of shape b) * L Surface Area = (perimeter of shape b) * L+ 2*(Area of shape b)

### RHS Congruence :

RHS Congruence RHS-Right Angle Hypotenuse Side! When the right angle and the hypotenuse and the given side are equal for a right angle triangle then we say that the given 2 triangles are congruent.

### Example proving RHS congruence :

Example proving RHS congruence <B=<E=90 degrees AC=DF (hypotenuse) BC=EF (given side) E D A F C B

### Example proving AAA congruence :

Example proving AAA congruence A B P O Q In this figure QA and PB are perpendiculars to AB. If AO is equal to 10cm, BO equal to 6cm, & PB equal to 9cm, Find AQ. Let us consider the triangles OAQ and OBP congruent. <A=<B A <AOQ=<BOP (vertically opposite angles) A <P=<Q (corresponding) A 10 AQ 6 = 9 90=6AQ AQ=15

### In a parallelogram if one angle A is equal to 110 degrees find the remaining angles? :

In a parallelogram if one angle A is equal to 110 degrees find the remaining angles? All sides of a parallelogram have to equal 360 degrees. So if Angle A is 110 degrees then 360=110 + B + C + D -110=- 110 250= B + C + D D also =s 110 360-220= 140 So B & C = 70.

### If the diagonals of a parallelogram are equal, then show it is a rectangle? :

If the diagonals of a parallelogram are equal, then show it is a rectangle? Theorem 11.1 If ABCD is a parallelogram then its nonconsecutive sides and its nonconsecutive angles are equal. Proof We need to prove that AB = CD, BC = AD.

### SASSide/Angle/Side :

SASSide/Angle/Side SAS- If 2 sides and the included angle are congruent to 2 sides and the included angle of a 2nd triangle, the 2 triangles are congruent. And included angle is an angle created by 2 sides of a triangle.

### SSSSide/Side/Side :

SSSSide/Side/Side It is a rule that is used in geometry to prove triangles congruent. The rule states that if 3 sides on 1 triangle are congruent to 3 sides of a 2nd triangle, the 2 triangles are congruent.

### AAAAngle/Angle/Angle :

AAAAngle/Angle/Angle If in 2 triangles, corresponding angles are equal, then their corresponding sides are in the same ratio and hence the 2 triangles are similar. b a f c d e <a=<d <b=<e <c=<f

### ASAAngle/Side/Angle :

ASAAngle/Side/Angle ASA is a rule used in geometry to prove triangles are congruent. The rule states that if 2 angles and the included side of one triangle are congruent to 2 angles and the included side of another triangle, the triangles are congruent.

### AASAngle/Angle/Side :

AASAngle/Angle/Side AAS is used in geometry to prove triangles are congruent. The rules state that if 2 angles and a non-included side of 1 triangle are congruent to 2 angles and the corresponding non-included side of another triangle the 2 triangles are congruent.

### CPCTCCorresponding Parts of Congruent Triangle Are Congruent/Equal :

CPCTCCorresponding Parts of Congruent Triangle Are Congruent/Equal When 2 triangles are congruent, all 6 pairs of corresponding parts {angles & sides} are congruent. This statement is usually simplified as corresponding parts of congruent triangles are congruent. If                          then the following conditions are true:

### E q u i v a l e n c er e l a t i o n s :

E q u i v a l e n c er e l a t i o n s Reflexivity: a ~ a *Every triangle is congruent to itself Symmetry: if a ~ b then b ~ a Transitive: if a ~ b and b ~ c then a ~ c.

### Slide 17:

1 2 3 4 5 6 7 8 <1, <5 <2,<6 <3,<7 <4,<8 Corresponding angles <3, <5 <4, <6 Alternate Interior Angles <1, <7 <2, <8 Alternate Exterior Angles In geometry, adjacent angles are angles that have a common ray coming out of the vertex going between two other rays. Ex. Of adjacent Angles

### Supplementary Angles :

Supplementary Angles A pair of angles are supplementary if their respective measures sum to 180°. If the two supplementary angles are adjacent (i.e. have a common vertex and share a side, but do not have any interior points in common) their non-shared sides form a line.

### Complementary Angles :

Complementary Angles A pair of angles are complementary if the sum of their angles is 90°. If the two complementary angles are adjacent (i.e. have a common vertex and share a side, but do not have any interior points in common) their non-shared sides form a right angle.

### Slide 20:

Area of Circle= πr² Arc length= circumference-2πr * Area/360 Arc length=Circumference multiplied by πr² divided by 2πr Area of a sector= A= mAB/360 * πr² (

What π =

### Slide 23:

l- length b- base h- height W- width a- just a side s- side 