In a triangle , the length of the first side is 5 cm less than the length of the second side . The length of the third side is 7 cm more than the length of the first side if the first side is of length is 18 cm , then what is the semiperimeter of the triangle?
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Given :
To find :
Knowledge Required :
→ Formula to calculate semi perimeter of triangle = Perimeter ÷ 2 or (a + b + c) ÷ 2
where,
Solution :
Second side :
The length of the first side is 5 cm less than the length of the second side.
→ 18 = second side - 5
→ 18 + 5 = second side
→ 23 = second side
Third side :
Length of the third side is 7 cm more than the length of the first side.
→ Third side = 7 + 18
→ Third side = 25 cm
Semi perimeter = (a + b + c) ÷ 2
→ Semi perimeter = (18 + 23 + 25) ÷ 2
→ Semi periemter = 66 ÷ 2
→ Semi periemter = 33
Semi perimeter of the triangle = 33 cm