Dudies I need my answer real quick yk my exams are comin up....... so please for god sake solve question no. 3rd asap
Answers
Hey split the quadrilateral into two right triangles.
Then use pythagoras theorem to find the unknown side. Use 1/2bh to calculate the area of each triangle and add them up.
Try by yourself :)
Answer:
Area of ABCD = 234cm²
Step-by-step explanation:
After drawing the figure....
In triangle ADC, By Pythagoras Theorem
AD² + DC²=AC²
AD²+20² = 25²
AD² + 400 = 625
AD² = 625-400
AD² = 225
AD = 15cms
Area of triangle ADC = 1/2*B*H
= 1/2*20*15
= 150cm²
In triangle ABC, By Pythagoras theorem
AB² + BC² = AC²
7² + BC² = 25²
49 + BC² = 625
BC² = 625-49
BC² = 576
BC = 24cms
Area of triangle ABC = 1/2*B*H
= 1/2*24*7
= 84cm²
Area of ABCD = Area of triangle ABC + Area of triangle ADC
= 84 + 150
= 234cm²
Therefore, Area of ABCD = 234cm²