find the area of a triangle with sides 13cm,12cm and 5cm.
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Answer:
Step-by-step explanation:
Perimeter of the triangle (2s) =sum of all sides
=13+12+5
=30cm
Semi perimeter(s) =30÷2=15cn
By heron's formula
Area of triangle=[s (s-a)(s-b)(s-c) ]root over
=[15 {(15-13)(15-12)(15-5)} ] root over
=[15 {2×3×10} ]root over
=[15×2×3×10] root over
=30 sq cm
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