URGENT:
The formula for the circumference of a circle is C=2 pi r. Use 3.14 for pi. Solve the formula for r. What is the radius of a circle with a circumference of 87 cm? Round the the nearest tenth. Show your work.
A- C over 2 pi; 13.9cm
B- 2 pi over C; 27.7cm
C- 2 pi C; 546.4cm
D- C - 2 pi; 80.7cm
The formula for the area of a triangle is A = bh over 2. Solve the formula for h. What is the height of a triangle that has an area of 25 mi^2 and a base with a length of 10 mi? Show your work. Round to the nearest tenth.
A- h=2Ab; 1.25 mi
B- h=2Ab; 2.5 mi
C- h=2A over b; 0.2 mi
D- h=2A over b; 5 mi