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Class 7 A Tale of Three Intersecting Lines worksheet
CBSE Mathematics. Triangle inequality, angle sum, exterior angles, kinds of triangles, isosceles triangles. Every sheet has 20 questions in three sections and an answer key, and the numbers change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
Can 4 cm, 8 cm and 16 cm be the sides of a triangle?
- Only if it is right-angled
- Yes
- Only if two sides are equal
- No
Answer
(d) No
4 + 8 is not more than 16
- 2.
Two angles of a triangle are 120° and 33°. The third angle is:
- 27°
- 207°
- 87°
- 37°
Answer
(a) 27°
180° − 153°
- 3.
The three angles of a triangle add up to:
- 270°
- 90°
- 180°
- 360°
Answer
(c) 180°
Section B · short answer
- 4.
The angles of a triangle are x, x + 29° and x + 34°. Find x and the three angles.
Answer
x = 39°; 39°, 68°, 73°
3x + 63° = 180°; 3x = 117°
- 5.
An exterior angle of a triangle is 100° and one of the opposite interior angles is 74°. Find the other opposite interior angle and the angle next to the exterior angle.
Answer
26°; 80°
100° − 74°; 180° − 100°
Section C · long answer
- 6.
Isha has three fence pieces of 7 m, 17 m and 18 m. Can they make a triangular pen? If yes, what is its perimeter?
Answer
Yes; 42 m
every two pieces together are longer than the third
Fresh sheets for your child
In the app, every A Tale of Three Intersecting Lines sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
Coming soon for Android and iPhone.