First slide

Introduction to 3-D Geometry

Question

$If (Cos α, \sin α, 0), (\cos β, \sin β, 0), (\cos γ, \sin γ, 0) are vertices of a triangle then circum radius R is$

Moderate

A

1
B

2
C

3
D

4

Solution

$C l e a r l y t h e v e r t i c e s a r e e q u i d i s \tan t f r o m t h e o r i g i n . ∴ o r i g i n O i s t h e c i r c u m c e n t e r o f t h e t r i a n g l e . ∴ c i r c u m r a d i u s R = O A = 1$

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