3. The points (2, 4), (4,2), (7,1) are the vertices of
a) an equilateral triangle b) a scalene triangle
c) an isosceles triangle d) a right angled triangle​

Benefiting gif hebr hen ben bb i don’t know if you want me or not but i’m just

Hello! i hope this
since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.

Ibelieve it's a. 2.2 - x = -10.85 (plz tell me if it's right : ) )