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Pythagoras’s theorem
Check whether a triangle is a right-angled triangle
MCQ
A triangle has sides measuring 7 cm, 24 cm and 25 cm. What can we say about it?
Possible answers
The triangle is right-angled, because
25
2
=
7
2
+
24
2
25^2 = 7^2 + 24^2
2
5
2
=
7
2
+
2
4
2
The triangle is not right-angled, because
25
2
≠
7
2
+
24
2
25^2 \neq 7^2 + 24^2
2
5
2
=
7
2
+
2
4
2
The triangle is right-angled, because
24
2
=
7
2
+
25
2
24^2 = 7^2 + 25^2
2
4
2
=
7
2
+
2
5
2
Nothing can be stated without measuring the angles
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