# If vector P+vector Q=vector R ;and if P^2+Q^2=R^2 then find the angle between the vectorP and vectorQ?

##### 1 Answer

Jun 15, 2018

(This should be clear from the start - Pythagoreas' Theorem)

#### Explanation:

#(bbP + bbQ)*(bbP + bbQ)#

And because

# (bbP + bbQ) * (bbP + bbQ) = bbR * bbR = R^2 qquad triangle #