Therefore Rent charged from a company for 3 month How much rent did it pay?įirst we find the semi perimeter of triangular side measuring 122 m, 22m and 120 m. A company hired one of its walls for 3 months. The advertisements yield an earning of Rs 5000 per m 2 p e r y e a r. The sides of the walls are 122 m, 22 m and 120 m (see figure). Q.2 The triangular side walls of a flyover have been used for advertisements. Therefore Required area = 3√ 4 × ( 60 ) 2 cm 2 To find the area when its perimeter = 180 cm Therefore here a = b = c (= a) and s = 1 2 ( a + a + a ) = 3 a 2 Since Δ ABC is given as equilateral of side = a If a, b, c be the lengths of sides BC, CA and AB of Δ ABC and if s = 1 2 ( a + b + c ), thenĪrea of Δ ABC = s ( s − a ) ( s − b ) ( s − c )−−−−−−−−−−−−−−−−−−√ To find the area of an equilateral triangle using Heron’s formula.| If its perimeter is 180 cm, what will be the area of the signal board? Find the area of the signal board using Heron’s formula. Q.1 A traffic signal board, indicating ‘SCHOOL AHEAD’, is an equilateral triangle with side ‘a’.
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