Trigonometry: Find the length of side x on the right-angled triangle.

To answer this question it is best to remember SOH CAH TOA.SOH: sin(angle)=opposite (length of side opposite the angle)/hypotenuse (length).CAH: cos(angle)=adjacent (length of side next to the angle)/hypotenuse.TOA: tan(angle)= opposite/adjacent.
In a question like this you will be given an angle within the triangle, for example 60 degrees, and the length of one side, for example the hypotenuse as 13cm. If the side labeled x is adjacent to the angle then we will use CAH: cos(angle)= adjacent side/hypotenuse
So, cos60= adjacent/13Rearrange the equation to get adjacent = cos60 x 13Answer= 6.5

MK
Answered by Molly K. Maths tutor

4598 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Write 36 as a product of its prime factors


What is the equation for calculating the surface area of a cylinder?


What is the perpendicular bisector of the point (0,2) and (1,0)?


Solve: x^2-x-6 using factorisation.


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences