What is the area of a triangle whose sides measure 15 inches, 18 inches, and 21 inches?

Give your answer in simplified radical form.

Guest May 1, 2020

#1**+3 **

FIrst is it a right triangle ? 15^2 + 18^2 = 21^2 No it is not

Try using Heron's Formula

ElectricPavlov May 1, 2020

#3**0 **

You may also be able to use Pythagoras Theorem (SSS) to find x.y and then convert x.y into radical form x a/b

x = whole number

y = .decimal

a/b = fraction from y

MathsLlama
May 1, 2020

#1**0 **

Area=√p(p−a)(p−b)(p−c)

Where p is half the perimeter = a+b+c/2

This is the formula for finding the area of a triangle with 3 different sides (called Heron's Formula), but unfortunately, I can't help you when it comes to simplified radical form as I do not know how to calculate that.

MathsLlama May 1, 2020

#3**0 **

You may also be able to use Pythagoras Theorem (SSS) to find x.y and then convert x.y into radical form x a/b

x = whole number

y = .decimal

a/b = fraction from y

MathsLlama
May 1, 2020