3 years ago

Please help! I will mark you as brainliest!

Mathematics

2 answers:

Lisa [10]3 years ago

8 0

Answer:

105.6 cm²

Step-by-step explanation:

Area of full circle = π × r²

Semicircle = Half it

3.142 × 8.2² = 211.26808 ( Full circle)

211.26808 ÷ 2 = 105.63404

105.6 cm²

aliya0001 [1]3 years ago

6 0

Answer:

105.6 cm²

Step-by-step explanation:

The area (A) of a circle is calculated as

A = πr² ( r is the radius ), thus the area of a semicircle is half the area of the circle, that is

A = $\frac{1}{2}$ πr² ( with r = 8.2 )

A = 0.5 × 3.142 × 8.2²

= 0.5 × 3.142 × 67.24 ≈ 105.6 cm² ( to 1 dec. place )

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