Start learning →

At a crossing of two lines, one angle is 70°. How large is the angle across from it?

A110°
B20°
C290°
D70°
Answer & Solution
Correct answer: D. 70°
1. Angles opposite each other at a crossing are vertical angles. 2. Vertical angles are always equal, so the opposite angle is 70°. 3. 110° is the angle next to it on the line (180° - 70°), not the opposite one. _Source: Wikipedia, Angle, Adjacent and vertical angles_
Practise this question with Quill — CTET →

Keep practising Basic Geometrical Ideas

Browse all Basic Geometrical Ideas questions for CTET, or explore more Mathematics topics.

Start a Basic Geometrical Ideas lesson →
Related questions
In strict maths, a circle is only the boundary of which region?A ring-shaped region between two circles with the same centre is called what?What is the point equally far from every point on a circle called?What do we call half of a circle cut along a diameter?A line that goes into a circle and out again at two points is named what?Touching a circle at just one point, a straight line is called what?The region cut off from a circle by one chord, along with its arc, has what name?A region bounded by two radii and an arc of a circle is called what?