Question

an isosceles triangle has perimeter 30cm and each of the equal sides is 12cm . Find the area of a triangle.​

Answer 1

Answer:

A≈40.25cm²

b Base

12

cm

P Perimeter

30

cm

Using the formulas

A=bhb

2

P=2a+b

hb=a2﹣b2

4

Solving forA

A=1

4bP(P﹣2b)=1

4·12·30·(30﹣2·12)≈40.24922cm²

Answer 2

Answer:

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Step-by-step explanation:

A≈40.25cm²

b Base

12

cm

P Perimeter

30

cm

Using the formulas

A=bhb

2

P=2a+b

hb=a2﹣b2

4

Solving forA

A=1

4bP(P﹣2b)=1

4·12·30·(30﹣2·12)≈40.24922cm²