Which of the following instruments is used for constructing angles and bisecting lines? Ruler C Protractor Set square If a circle has a radius of 7 cm, what is its diameter? 3.5 cm 7 cm 14 cm 21 cm

The correct answer for the first question is C. Set square. A set square, also known as a triangle, is a tool used for constructing angles and bisecting lines. It typically has a right angle and one or more other angles, which can be used to draw various angles and lines.<br /><br />The correct answer for the second question is C. 14 cm. The diameter of a circle is twice its radius. Since the radius of the circle is given as 7 cm, the diameter would be 2 * 7 cm = 14 cm.