Class IX

The edges of a triangular board are 6 cm, 8 cm and 10 cm. The cost of painting it at the rate of 9 paise per cm2 is
  1. Rs 2.00
  2. Rs 2.16
  3. Rs 2.48
  4. Rs 3.00
Area of a triangle is
  1. (1/3)*base*height
  2. base*height
  3. 2*base*height
  4. (1/2)*base*height
Heron formula is
  1. Δ = √{s*(s+a)*(s+b)*(s+c)}
  2. Δ = √{s*(s-a)*(s-b)*(s-c)}
  3. Δ = √{s*(s-a)*(s-b)*(s-c)}, s = a + b + c
  4. Δ = √{s*(s-a)*(s-b)*(s-c)}, 2s = a + b + c
The area of a trapezium is 1700 m2 . If one of the parallel sides is 64 m and the distance between the parallel sides is 34 m, then the length of the other parallel side is
  1. 33 m
  2. 34 m
  3. 35 m
  4. 36 m
A square and an equilateral triangle have equal perimeters. If the diagonal of the square is 12√2 cm, then area of the triangle is :
  1. 24√2 cm²
  2. 24√3 cm²
  3. 48√2 cm²
  4. 64√3 cm²
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