abcd is an isosles trapezium. ab and dc are parallel sides.perpendicular de and cf are drawn an ab. find out if triangle ade is perpendicular to triangle bcf
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ADC = 90°
Ab parallel to dc
ab = 15 cm
cd = 40cm
ac = 41 cm
Using Pythagoras Theorem
ad² + dc² = ac²
ad² + 40² = 41²
ad² + 1600 = 1681
ad = √1681- 1600
ad = √81
as = 9 cm
area of trapezium =1/2 × (base1 + base2) × h
1/2× ( 15 + 41) × 9
= 247.5 cm²
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