Lines and Angles flashcards
33 practice cards drawn from the Lines and Angles lessons. Tap a card to turn it over. Every answer is checked against the lesson it came from.
Read the Lines and Angles lessons in full →
Three angles share a point. Two are 100° and 110°. The third?
150
from “Angles at a Point”
Three angles share a point. Two are 130° and 120°. The third?
110
from “Angles at a Point”
One angle on a straight line is 55°. What is the other?
125
from “Angles on a Line”
One angle on a straight line is 87°. What is the other?
93
from “Angles on a Line”
One angle of a complementary pair is 49°. What is the other?
41
from “Complementary Angles”
Complementary angles add up to…?
90°
from “Complementary Angles”
Two lines cross. One angle is 75°. What is the angle next to it on the line?
105
from “Vertically Opposite Angles”
Two lines cross. One angle is 30°. What is the angle next to it on the line?
150
from “Vertically Opposite Angles”
How many pairs of parallel sides does a trapezium have?
1
from “Parallel and Perpendicular Lines”
Two lines are the same length. Must they be parallel?
no
from “Parallel and Perpendicular Lines”
Which dot finishes a line parallel to the drawn one?
C
from “Drawing Parallel and Perpendicular Lines”
Which dot makes the second line perpendicular to the first?
C
from “Drawing Parallel and Perpendicular Lines”
Co-interior angles on parallel lines. One is 111°. What is the other?
69
from “Angles in Parallel Lines”
Corresponding angles on parallel lines. One is 63°. What is the other?
63
from “Angles in Parallel Lines”
Two angles in a triangle are 73° and 69°. What is the third?
38
from “Angles in a Triangle”
Two angles in a triangle are 80° and 39°. What is the third?
61
from “Angles in a Triangle”
What do the inside angles of a 3-sided shape add to?
180°
from “Angles in a Polygon”
What do the inside angles of a 8-sided shape add to?
1080°
from “Angles in a Polygon”
A regular 12-sided shape. How big is each inside angle?
150
from “The Interior Angle of a Regular Polygon”
A regular 5-sided shape. How big is each inside angle?
108
from “The Interior Angle of a Regular Polygon”
You are constructing the perpendicular bisector of AB. What comes next?
Strike an arc from B at that same width
from “Constructing a Perpendicular Bisector”
You are bisecting angle V with compasses and a straight edge. What comes next?
Strike equal arcs from the two marks on the arms
from “Constructing an Angle Bisector”
You are constructing the perpendicular from P to the line. What comes next?
Rule from P through the arcs’ crossing
from “Constructing a Perpendicular from a Point”
Which path from P down to the line is shortest?
the perpendicular
from “Constructing a Perpendicular from a Point”
You are constructing a triangle with sides 8 cm, 6 cm and 5 cm. What comes next?
Set the compass to 6 cm and strike an arc from A
from “Constructing a Triangle”
A path runs exactly 3 m from a long straight wall, on one side. What shape is it?
a straight line parallel to the wall
from “Loci”
Which line collects the points equally far from the two arms of an angle?
the angle bisector
from “Loci”
On a flat page, what do a triangle's angles add to?
exactly 180
from “Triangles on a Sphere Break the 180 Rule”
On the surface of a globe, what do a triangle's angles add to?
more than 180
from “Triangles on a Sphere Break the 180 Rule”
With compasses and a straight edge, is it possible to bisect any angle?
possible
from “Why an Angle Cannot Be Trisected”
With compasses and a straight edge, is it possible to trisect any angle?
impossible
from “Why an Angle Cannot Be Trisected”
Find the exterior angle x: first the third angle inside, then the straight line.
112
from “Angle Chases”
Chase x: first the alternate angle of 68°, then the angles on the straight line.
112
from “Angle Chases”