Test : Shapes and Angles - Class 5 MCQ

Measure of angle drawn by Danish = 140°
 Measure of angle drawn by Manish = 2 x 140° = 280 = (360 - 240)  =  80°

The correct option is answer D.

From the given image, angle Q appears to be the topmost angle of a house-like shape. The two lines forming angle Q slant upwards and meet at a point, forming an angle greater than 90°.

Since the angle is more than 90°, it is classified as an Obtuse angle.

The solution involves counting the number of angles in the given figures that are less than 90°. Here’s a refined explanation:

• Examine each angle in the figures provided.
• Identify angles that are acute (less than 90°).
• Count these acute angles carefully.

Based on this analysis, the total number of acute angles in the figures is 3.

To determine how many angles are greater than a right angle:

• A right angle measures 90 degrees.
• An angle greater than a right angle is called an obtuse angle.
• Examine each angle in the image to see if it is more than 90 degrees.

There are 3 angles greater than a right angle.

The solution to find which line is perpendicular to AB involves understanding perpendicularity in geometry:

• Perpendicular lines intersect at a 90-degree angle.
• In the given figure, line EF is perpendicular to line AB.

This means that EF forms a right angle with AB.

The solution to find which angle is greater than a right angle is as follows:

• Right angles measure exactly 90 degrees.
• An angle greater than a right angle is called an obtuse angle, and measures between 90 and 180 degrees.
• Among the given options, option D is identified as an obtuse angle, measuring more than 90 degrees.

The given angle is a acute angle.
The approximate value of above angle is 45°
 , as the angle of 20°  would be very small than the given angle Hence the correct answer is option B.

An angle between 90 and 180 degree is called an obtuse angle.