Answer:
Area of circle is
Step-by-step explanation:
Formula for circumference of circle is given as,
Given that C = 15 n cm,
Substituting the value,
Solving above equation for r, divide both side by
Simplifying,
Formula for area of circle is given as,
Substituting the value of r,
Squaring the parenthesis,
Cancelling out the common term,
Therefore, area of circle in terms of n is
Answer:
2598 units²
Step-by-step explanation:
Sum the parts of the parts of the ratio 3 + 5 + 7 = 15 parts
Divide the perimeter by 15
300 ÷ 15 = 20 ← value if 1 part, thus sides of triangle are
3 × 20 = 60
5 × 20 = 100
7 × 20 = 140
Using Hero's formula to calculate the area
A =
where s is the semi perimeter and a, b , c are the sides of the triangle
s = 300 ÷ 2 = 150
let a = 60, b = 100 and c = 140, then
A =
=
= ≈ 2598 units²