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First, find it's perimeter then divide it by 2.

Then to find the area:

That's Heron's formula for area of triangle

The Brainliest Answer!

Where

Given the sides a, b, and c of a triangle, solve its semi-perimeter first, then find the area.

The triangle has sides 3 cm, 4 cm and 5 cm.

Semi-perimeter:

s = (3 + 4 + 5)

s = ¹/₂ (12)

s = 6

Solve for area given s (6 cm) and sides a=2 cm; b=4cm; c=5 cm

Area =

Area =

Area =

Area = 6 cm²

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In finding the radius of the circumscribing circle of a triangle, the formula in solving for radius is derived from Heron's formula. You may check the problem I solved her in brainly at link: brainly.ph/question/275941