Question

1. The breadth of a rectangle is 5 cm less than its length. If the length of the rectangle is 25 cm, find
givell that its perimeter is 780 m and breadth is 120 m.
the perimeter of the rectangle.
12. The perimeter of a triangle is 52 cm. Two of its sides are 17 cm and 18 cm respectively. Find the
length of the third side of the triangle.​

Answer 1

Answer:

I will tell you later okay

Answer 2

Answer:

12. The perimeter of a triangle is 52 cm. Two of its sides are 17 cm and 18 cm respectively. Find the length of the third side of the triangle.

Answer-

Triangle

Solve for height

hb≈15.27cm

a Side

17

cm

c Side

18

cm

P Perimeter

52

cm

Using the formulas

A=hbb

2

A=s(s﹣a)(s﹣b)(s﹣c)

P=a+b+c

s=a+b+c

2

Solving forhb

hb=﹣﹣P4+4P3a+4P3c﹣4(Pa)2﹣12P2ac﹣4(Pc)2+8Pa2c+8Pac2

2a﹣2P+2c=﹣﹣524+4·523·17+4·523·18﹣4·(52·17)2﹣12·522·17·18﹣4·(52·18)2+8·52·172·18+8·52·17·182

2·17﹣2·52+2·18≈15.27057cm