3. The area of a circular plate is 154 cm . Find the
a) radius of the circle
b) circumference of the circle (use
22
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Radius = 7cm
Circumference = 44cm
Step-by-step explanation:
- Radius
area = πr²
154cm² = (22/7)(r²)
(154×7)/22 = r²
1078/22 = r²
49 = r²
√49 = r
7 = r
radius = 7cm
- Circumference
Circumference = 2πr
= 2(22/7)(7)
= 308/7
= 44
Circumference = 44cm
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