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Math a-z
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German
Math topics
Math a-z
News
German
×
Angles
»
1. Angles on a straight line
2. Vertically opposite angles
Two straight lines g and h intersect.
This results in four angles whose measures
are labeled
α
,
β
,
γ
and
δ
.
Which of the statements on the right are correct?
To find the solution, you can touch the
straight lines at the
black points
and move them.
Vertically opposite angles
β
and
δ
have always the same measure.
α
and
δ
have always the same measure.
If
α
= 90°
⇒ all angle measures are equal.
Opposite angles are equal in measure.
If
α
= 75°
, then
β
is twice as large.
If
β
= 60°
, then
γ
is twice as large.
All four angles never have equal measure.
α
and
β
always add up to 180°.
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