Please answer this question :)

Question

Basically there's two diagrams , one a circle and the secondition diagram is a trapezium. they're two separate digrams.
The height of the trapezium is h
The other to lengths of the trapezium is 20cm and the other is 25cm.

The radii of the circle is 8.5cm.
The area of the circle is equal to the area of the trapezium.

Work out the value of h
Give your answer correct to 1 decimal plc.

Please give an aswer as soon as possible

Answer 1

Area of circle:

 

A = pi·r²

• pi = 3.14159...
• r = radius = 8.5 cm

 

Area of trapezium:

 

A = (1/2)(B1+B2)·h

• B1 = length of one base = 25 cm
• B2 = length of other base = 20 cm
• h = height of trapezium

 

The areas are equal so set them equal and plug in the known numbers:

 

pi·r² = (1/2)(B1+B2)·h

pi·(8.5²) = (1/2)(25+20)·h

 

Solve for h.