Class IX

If two line segments are equal then they are called 
  1. line segment
  2. Ray
  3. Congruent
  4. None of these
Area of a triangle when sides a=40 cm, b=24 cm and c=32 cm of triangle is given is
  1. 381 cm²
  2. 382 cm²
  3. 383 cm²
  4. 384 cm²
The length of each side of an equilateral triangle having an area of 9√3 cm2 is
  1. 8 cm
  2. 36 cm
  3. 4 cm
  4. 6 cm
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 the triangle whose two sides are 18 cm and 10 cm and the perimeter is 42 cm is 
  1. 16√11 cm²
  2. 18√11 cm²
  3. 21√11 cm²
  4. 22√11 cm²
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