In a regular polygon, all the angles should be equal in measure and all the sides should be equal in length. This is true only for figures 1 and 3.

At 12:00, the hour and the minute hand coincide with each other. In this case, the included angle is 0º. This is known as zero angle.

In a right-angled isosceles triangle, one angle is right angle and the rest two are acute and equal i.e. 45${}^{\circ }$.

A quadrilateral is a polygon with 4 sides. But, polygons may have more than 4 sides. So, all polygons need not be quadrilaterals, but all quadrilaterals are polygons.

A rectangular prism is basically a cuboid. A cuboid has 6 faces and 12 edges.

If all the angles of a triangle are less than 90 degrees, it is known as the acute-angled triangle.

There are only two options if at the start you are looking towards South.

We can't measure length using a compass. By guessing, the length measured will be less accurate. By using ruler we can measure, but the accuracy decreases if the angle at which it is viewed is not appropriate. By using the divider and a ruler, we can measure the length more accurately.

In one hour, minute hand covers 360° and hour hand covers 30°. When the minute hand covers 180°, hour hand covers 15°. So at 6:30, minute hand covers 180° and hour hand covers 195°. The angle included between the minute and hour hand at 6:30 is 15°.

In a parallelogram, opposite sides are equal and diagonals are not equal. All are true except 2 and 3.