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Determine the missing lengths of a 45-45-90 triangle ex. 1

Learn about the special right triangles. A special right triangle is a right triangle having angles of 30, 60, 90, or 45, 45, ...
BBC

Key points about solving 2D and 3D problems using Pythagoras' theorem

If the sides of the right-angled triangle are labelled 𝑎, 𝑏 and 𝑐 then Pythagoras' theorem can be written as the formula 𝑎² + 𝑏² = 𝑐². Pythagoras' theorem can be used to find the length of line ...
BBC

Key points about 2D and 3D trigonometry problems

Being able to identify which formula to use, sine or cosine, and when, is necessary to answer questions on this topic successfully. Check you are confident in how to use the sine and cosine rules.
Hindustan Times

Baudhayana framed right-angled triangle theorem: NCERT Class 8 textbook

Ancient Indian mathematician Baudhayana was the first person to formulate a theorem on right-angled triangles that in its modern form came to be associated with Greek mathematician Pythagoras, a newly ...