Question

1. Sides of a triangle are cm 45 cm, 39 cm and 42 cm, find its area.
P
56 m​

Answer 1

Step-by-step explanation:

this is your correct answer

Answer 2

Step-by-step explanation:

area of ∆ by using heron's formula

heron's formula =√s(s-a)(s-b)(s-c) where s is semi perimeter and a,b,c are sides

=√63(63-45)(63-39)(63-42)

=√63(18)(24)(21)

=√3×3×7(2×3×3)(2×2×2×3)(3×7)now we will make pair of no. and put outside from root

=3×3×3×2×2×7

=27×28

=756 cm square

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