Question

Activity 1: Calculate the area, given each radius. Use it = 3.14. Perform this
on a sheet of paper.
1.
8 m
25 dm
38 mm
int in
4.
75 in
9 cm​

Answer 1

Given :- Calculate the area, given each radius. Use π = 3.14.

Solution :-

1) radius = 8m .

so,

→ Area of circle = πr² = 3.14 * (8)² = 3.14 * 64 = 200.96 m²

1) radius = 25dm .

so,

→ Area of circle = πr² = 3.14 * (25)² = 3.14 * 625 = 1962.5 dm²

3) radius = 38mm .

so,

→ Area of circle = πr² = 3.14 * (38)² = 3.14 * 1444 = 4534.16 mm²

4) radius = 75 in .

so,

→ Area of circle = πr² = 3.14 * (75)² = 3.14 * 5625 = 17662.5 in²

5) radius = 9 cm .

so,

→ Area of circle = πr² = 3.14 * (8)² = 3.14 * 81 = 254.34 cm²

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