8th Grade Math Chapter 9a Review

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8th Grade MathChapter 9a Review
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Chapter 9b Review

• Give the formulas for
• a) area of a circle
• b) circumference of a circle

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Chapter 9b Review
Answer

• Give the formulas for
• a) area of a circle
• b) circumference of a circle

A ?r2
C ?d
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Chapter 9b Review

• 2) Give the formulas for
• a) area of a triangle
• b) area of a trapezoid

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Chapter 9b Review
Answer

• 2) Give the formulas for
• a) area of a triangle
• b) area of a trapezoid

bh A 2
(b1 b2)h A 2
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Chapter 9b Review

• 3) Find the perimeter and area of a rectangle
  with l 12 m and w 4 m.

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Chapter 9b Review
Answer

• 3) Find the perimeter and area of a rectangle
  with l 12 m and w 4 m.

Perimeter 32 m Area 48 m2
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Chapter 9b Review

• 4) Find the perimeter and area of this triangle.

8 in
6 in
5 in
10 in
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Chapter 9b Review
Answer

• 4) Find the perimeter and area of this triangle.

Perimeter 24 in Area 25 in2
8 in
6 in
5 in
10 in
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Chapter 10a Review

• 1) Find the perimeter and area of each figure
• Rectangle with length 4m and width 0.5m.

2 in
1.5 in
8 in
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Chapter 10a Review
Answer

• 1) Find the perimeter and area of each figure
• Rectangle with length 4m and width 0.5m.

2 in
1.5 in
8 in
Perimeter 20 in, Area 12 in2
Perimeter 9 m, Area 2 m2
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Chapter 10a Review

• 2) Find the perimeter and area of each figure

5 m
5 m
3 m
8 m
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Chapter 10a Review
Answer

• 2) Find the perimeter and area of each figure

5 m
5 m
3 m
8 m
Perimeter 21 m, Area 19.5 m2
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Chapter 10a Review

• 3) What is the shaded area?

8 cm
3 cm
4 cm
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Chapter 10a Review
Answer

• 3) What is the shaded area?

8 cm
3 cm
4 cm
Area 64 7.07 16 72.94 cm2