Triangles
ICSE · Class 7 · Mathematics
Practice quiz for Triangles — ICSE Class 7 Mathematics. MCQs and questions with answers to test your preparation.
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Quick Quiz: Triangles
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In triangle ABC, A = 35 b0 and B = 65 b0. Find C using the angle sum property.
In an isosceles triangle, the vertex angle is 50 b0. Find each base angle.
In triangle ABC, one exterior angle at C is 130 b0 and the two interior opposite angles are in the ratio 3:4. Find the two interior opposite angles.
A triangle has angles in the ratio 5:3:4. What is the difference between the largest and smallest angle?
Sample Questions
In triangle ABC, A = 55 b0 and B = 45 b0. A side is produced at C to form an exterior angle. Find that exterior angle.
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100 b0
The exterior angle equals the sum of the two interior opposite angles. So the exterior angle at C = 55 b0 + 45 b0 = 100 b0.
In an isosceles right angled triangle, what are the two equal acute angles?
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45 b0 and 45 b0
One angle is 90 b0. The other two angles are equal and their sum is 90 b0. So each one is 45 b0.
In triangle ABC, A = 2x + 20 b0, B = x + 30 b0, and C = 2x - 10 b0. Find x.
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28
Use the angle sum property: (2x + 20) + (x + 30) + (2x - 10) = 180. This gives 5x + 40 = 180, so 5x = 140 and x = 28.
A triangle has two angles 48 b0 and 73 b0. Find the third angle.
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59 b0
The sum of the three angles is 180 b0. The known angles add to 121 b0, so the third angle is 180 b0 - 121 b0 = 59 b0.
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