Page 144 - NUMINO TG_6A

09Transforming It into a Parallelogram Unit

2 . Find the area of each semicircle. b. The area of part of a circle can be found by
multiplying the fraction of the circle it
a. 8 yd represents by the area of the whole circle.

5 ft

2 cm 2. Find the area of a semicircle.

Area 3.14 2 2 1 Area 3.14 5 5 1 Area 3.14 88 1 Area of a semicircle
2 2 2
1
6.28 (cm2) 39.25 (ft2) 100.48 (yd2) = Area of the whole circle 2

The area of part of a circle can be found by multiplying the fraction of the circle it represents by the Example: Semicircle with a 2 cm radius.
area of the whole circle.
Area of a semicircle
3 . Each of the following figures is a quarter of a circle. Find its area.

a. b. 14 yd 2 cm 3.14 2 2 1
2
6 in.
3 cm 6.28 (cm2)

Area 3.14 3 3 1 1 1 3. Find the area of a quarter of a circle.
7.065 (cm2) 4 4 4
Area 3.14 6 6 Area 3.14 14 14 Area of a quarter of a circle
28.26 (in.2) 153.86 (yd2)
= Area of the whole circle 1
4

4 . Find the area of each colored figure. Example: Quarter of a circle with a 3 cm

a. b. radius.

1 of a circle 3 of a circle 1 of a circle Area of a quarter of a circle
3 4 6
1
6 cm 18 m 3 cm 3.14 3 3 4

1 12 in. 7.065 (cm2)
3
Area 3.14 6 6
37.68 (cm2)
Area 3.14 12 12 3 Area 3.14 18 18 1
339.12 (in.2) 4 169.56 (m2) 6

4. Find the area of the colored figures.

9. Transfoming It into a Parallelogram 77 Refer to .

4. Find the area of the colored figures.

Area of a colored figure Area of the whole circle fraction of the circle

Example: Area of 1 of a circle with a 6 cm radius
3

3.14 6 6 1 37.68 (cm2) 6 cm
3

4a. Area of 3 of a circle with a 12 cm radius 4b. Area of 1 of a circle with a 18 cm radius
4 6

3.14 12 12 4 3.14 18 18 1
3 6

339.12 (in.2) 12 cm 169.56 (m2) 18 cm

6A Unit 09 127