1.The sides of a triangular plot are in the ratio of 6 : 7 : 8 and its perimeter is 420 m. Find its area.
2.Find the area of an isoscles triangle with two equal sides as 5 cm each and the third side as 8 cm.
3.Find the area of a right-angled triangle whose base is 12 cm and height is 5 cm.
Answers
Step-by-step explanation:
hope the above two photos helps you
Answer:
Ans of first question.....
1) 6x+7x+8x=420
21x=420
x=420/21
x=20
let put the value of x...
6×20=120
7×20=140
8×20=160
let check it's right or not...
formula of perimeter of a triangle is the sum of their whole side....
so let check it..
120+140+160=420....
area of triangle =1/2×b×h..
= 1/2×120×140
= 1×120×70
= 8400
ans of 2 question....
area of a triangle = 1/2×b×h
=1/2×5×5
= 25÷ 2
= 12.5
3) area of triangle =1/2 ×b×h
= 1/2× 12× 5
= 30....
I hope it will help you...
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