What is angle; measure of an angle; sense of an angle ; right angle ?

What is the measure of angle DBC ?

In triangle XYZ, the measure of angle X is 30° greater than the measure of angle Y and angle Z is a right angle. Find the measure of ∠Y.

Fill in the blanks with acute, obtuse, right or straight : (a) An angle whose measure is less than that of a right angle is______. (b) An angle whose measure is greater than that of a right angle is ______. (c) An angle whose measure is the sum of the measures of two right angles is _____. (d) When the sum of the measures of two angles is that of a right angle, then each one of them is ______. (e) When the sum of the measures of two angles is that of a straight angle and if one of them is acute then the other should be _______.

What is the measure of (i) a right angle? (ii) a straight angle?

An angle of measure 180^(@) is called a zero angle (b) a right angle (c) a straight angle a reflex angle

Right triangle a triangle whose one angle is a right angle is called a right-angled triangle or a right triangle.

Fill in the blanks: A right triangle cannot have an ……..angle. The acute angles of triangle triangle are…. Each acute angle of an isosceles right angle measure….. Each angle of an equilateral triangle measure. The side opposite the right angle of a right triangle is called…. The sum of the lengths of the sides of a triangle is called its…..