Question

Two sides of a triangle are 10cm and 12cm. The perimeter of the triangle is 40cm. Find the third side.

3 points

Your answer


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Answer 1

Answer:

Let the third side be x.

Perimeter of triangle=sum of three sides.

=> 40=10+12+x .

=> x+22=40 .

=> x=40-22 .

=> x=18 .

Thus, the third side of triangle is 18 m .

Answer 2

Answer:

Triangle

Solve for side

c=18cm

a Side

10

cm

b Base

12

cm

P Perimeter

40

cm

Using the formula

P=a+b+c

Solving forc

c=P﹣a﹣b=40﹣10﹣12=18cm