Answer:
C / (2pi) = r; r= 13.9 cm
2A/b = h ; h= 5
Explanation:
The formula for the circumference of a circle is C = 2* pi * r.
Solving for r, we need to divide by 2 * pi on each side
C/(2* pi) = 2*pi*r/ (2* pi)
C / (2pi) = r
If the circumference is 87, we can find r by substituting into the equation.
87 / (2 * 3.14) = r
87/ 6.28 = r
13.85350318=r
Rounding to the nearest tenth
r= 13.9 cm
The formula for the area of a triangle is A = bℎ /2
To solve the formula for h, we need to multiply each side by 2
2*A = bh
Then divide each side by b
2A/b = bh/b
2A/b = h
If the area of a triangle is 25 and the base of 10 , we can substitute in to find the height.
2* 25 /10 = h
50/10 = h
5 =h