11th Class ICS Mathematics Chapter 12 Test Online

The in-radius r of a triangle is given by:

• 
  A
• 
  B
• 
  C
• 
  D

In a right isoceles triangle, one acute angle is:

• 30° A
• 45° B
• 60° C
• 75° D

In a triangle ABC if a² - b² + c² = ac then < ß =

• 
  A
• 
  B
• 
  C
• 
  D

If 2s = a + b + c, where a, b, c are the sides of a triangle ABC, then area of triangle ABC is given by:

• 
  A
• 
  B
• 
  C
• 
  D

If α, ß, Γ are the angles of a oblique triangle, then:

• α = 90° A
• ß = 90° B
• Γ = 90° C
• none of these D

r₁ =

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  D

If 2s = a + b +c, then in any triangle ABC:

• 
  A
• 
  B
• 
  C
• none of these D

• 
  A
• 
  B
• 
  C
• 
  D

A circle which touches one side of a triangle externally and the other two produces sides internally is known as:

• 
  A
• 
  B
• 
  C
• 
  D

In triangle ABC, if α = 90° then:

• 
  A
• 
  B
• 
  C
• none of these D

A circle drawn inside a triangle and touching its sides is known as:

• 
  A
• 
  B
• 
  C
• 
  D

When two sides and included angle is given, then area of triangle is given by:

• 
  A
• 
  B
• 
  C
• all of these D

If the elevation of the sun is 30°, the length of the shadow cast by a tower of 150m height is:

• 
  A
• 
  B
• 
  C
• none D

In a triangle ABC, (s - a)(s - b) = s(s - c), then the angle Γ =

• 
  A
• 
  B
• 
  C
• 
  D

In any triangle ABC, law of sines is:

• 
  A
• 
  B
• 
  C
• 
  D

The lengths of the sides of a triangle are proportional to the sines of the opposite angles to the sides. This is known as:

• The law of sines A
• The law of cosines B
• The law of tangents C
• The fundamental law D

• 3:5:2 A
• 
  B
• 3:2:1 C
• 1:2:3 D

r r₁ r₂ r₃ =

• 
  A
• 
  B
• 
  C
• abc D

A circle passing though the vertices of a triangle is known as:

• 
  A
• 
  B
• 
  C
• 
  D