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Question
If two sides of a triangle are 5 cm and 9 cm, then the third side is ________
Options
5 cm
3 cm
4 cm
14 cm
Solution
If two sides of a triangle are 5 cm and 9 cm, then the third side is 5 cm
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Using the given information, write the type of triangle in the table given below
| S.No | ∠1 | ∠2 | ∠3 | Type of triangle based on angles | Type of triangle based on sides |
| i. | 60° | 40° | 80° | Acute angled triangle. | Scalene Triangle |
| ii. | 50° | 50° | 80° | ||
| iii. | 45° | 45° | 90° | ||
| iv. | 55° | 45° | 80° | ||
| v. | 75° | 35° | 70° | ||
| vi. | 60° | 30° | 90° | ||
| vii. | 25° | 64° | 91° | ||
| viii. | 120° | 30° | 30° |
Which of the following is not possible?
The diagram shows a square ABCD. If the line segment joins A and C, then mention the type of triangles so formed.
State the following statement is true or false? Why?
Every equilateral triangle is an isosceles triangle
If one angle of an isosceles triangle is 70°, then find the possibilities for the other two angles
State the following statement is true or false? Why?
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Complete the following table:
| Types of Triangle/Its Angles | Acute angled triangle | Right angled triangle | Obtuse angled triangle |
| Any two angles | Always acute angles | i. | Always acute angles |
| Third angle | ii. | Right angle | iii. |
