Question

MENTAL MATHS
1. Fill in the blanks:
(1) A triangle has atleast .... acute angles.
(ii) A triangle cannot have more than ... right angle.
(ii) A triangle cannot have more than ... obtuse angle.
(iv) In every triangle, the sum of (interior) angles of a triangle = ... right angles.
(v) In every triangle, an exterior angle + adjacent interior angle = ... degrees.
(vi) In every triangle, an exterior angle = sum of the ... interior opposite angles.
(vii) In a right angled triangle, if one of the acute angle measures 25° then the measure
of the other acute angle is ......
2. State whether the following statements are true (T) or false (F):
(1) A triangle can have all three angles with measure greater than 60°.
(ii) A triangle can have all three angles with measure less than 60°.
(iil) If an exterior angle of a triangle is a right angle, then each of its interior opposite
angle is acute.
(id) In a right angled triangle, the sum of two acute angles is 90°.
(v) If all the three sides of a triangle are equal, then it called a scalene triangle.
(vi) Every equilateral triangle is an isosceles triangle.
(vii) Every isosceles triangle must be an equilateral triangle.
​

Answer 1

1st main answers mate.....,

1) 1 acute angle

2) 1 right angle

3) 1 obtuse angle

4) 2

5) 180°

6) corresponding

7) ............ sorry

2nd main answers mate........,

1) False

2) False

3) True

4) True

5) False

6) False

7) False

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