Question

Two sides of triangle are 10 cm, 15 cm, the perimeter of triangle is 30 cm then find the third side of triangle​

Answer 1

Given

• Two sides of triangle are 10 cm, 15 cm
• Perimeter of triangle is 30 cm

Explanation:

Let the third side be c and Now We can find the third side by using Formula of the perimeter as:-

$\circ{\pmb{\boxed{\sf{ Perimeter_{( \Delta )} = a+b+c }}}} \\ \\ \\ \colon\implies{\sf{ 30 = a+b+c }} \\ \\ \\ \\ \colon\implies{\sf{ 30 = 10+15+c }} \\ \\ \\ \colon\implies{\sf{ 30 = 25+c }} \\ \\ \\ \colon\implies{\sf{ 30 - 25 = c }} \\ \\ \\ \colon\implies{\sf{ c = 5 \ cm }}$

Hence,

• The Third side of triangle will be 5 cm.

More to Know:

$\circ \ {\pink{\pmb{\boxed{\sf{ Area_{( \Delta )} = \dfrac{1}{2} \times Base \times Height }}}}} \\ \\ \circ \ {\pink{\pmb{\boxed{\sf{ Area_{( \Delta )} = \sqrt{ s(s-a)(s-b)(s-c) } }}}}}$

Answer 2

Answer:

The third side of triangle is 5cm.