Mary is five times older than Julian. If the sum of their ages is 42, how old is Mary?
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The area of a circle is \pi r^2, where r is the radius of the circle. The diameter of a circle is the length of a line that passes through the center of the circle and stops at the perimeter of circle. The radius of a circle is half the diameter. Divide the diameter by 2 to find the radius.
1. 2.8 m / 2 = 1.4 m
2 .
: Plug in the value we just found for r.
3.
: Use the order of operations (PEMDAS).
4.
The area of the circle is equal to
1. 2.8 m / 2 = 1.4 m
2 .
3.
4.
The area of the circle is equal to