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i) If the perimeter of triangle is 180 cm then find the side of a triangle. c) 50 cm a) 40 cm ii) Find the value of semiperimeter "S" a) 70 cm b) 60 cm d). 70 cm b) 80 cm c) 90 cm d) 100 cm iii) If a, b & c are side of triangle, then write the formula to find perimeter. b) 3 S=a+b+c a) 2S = a+ b+ c c) S=a+ b+ c d) 4 S =a + b +c iv) Find area of signal board in the above figure. a) 300 V3cm? b) 600 V3cm? c) 900 V3cm? d) 800 cm? v) Which message provided by the above question ? a) Charity c) Awareness about traffic rules b) To help the poor d) None of the above |
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Answer» Answer: For an EQUILATERAL triangle with SIDE ‘a’, area
∴ Each side of the triangle = a cm ∴ a + a + a = 180 cm ⇒ 3a = 180 cm
Now, s = Semi–perimeter ∴ Area of a triangle
∴ Area of the GIVEN triangle
THUS, the area of the given triangle |
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