During van mahotsva ,some children planted trees in a triangular region,two sides of which are 18m and 10m and the perimeter is 42m.find the area of planted region
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Answer:
21√11 m2
Step-by-step explanation:
AB + BC + CA = 42
18 + 10 + CA = 42
CA = 42 - 28 = 14m
by herons formula ...
S = (AB + BC + CA) / 2
S = 42/2 = 21m
area of triangle ABC = √S(S-A)(S-B)(S-C)
= √ 21×3×11×7
= 3×7√11
= 21√11m2
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21√11 m^2 ...............
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