# Coat of arms

The class created its coat of arms, which had a shape composed of an isosceles trapezoid ABCD (shorter base is a = 4.5 cm long, longer 2a = 9 cm, trapezoid height 6 cm) and a semicircle with center S and diameter AB. Three identical isosceles triangles formed the trapezoid. Pupils painted half of the semicircle and the middle field of the trapezoid (central triangle) gray. How many were cm

^{2}areas of the coat of arms gray? Round the result to one decimal place.### Correct answer:

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Calculation of an isosceles triangle.

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Calculation of an isosceles triangle.

See also our trigonometric triangle calculator.

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