ΔABC is an equilateral triangle. m∠A = (3x - 12)°. Solve for x. A) 14 B) 19 C) 20 D) 24
2 answers:
Answer:
option (d)
Step-by-step explanation:
An equilateral triangle is a triangle whose all the sides are equal and all the angles are same.
There are three angles in a triangle and the according to the property of the angles of a triangle, the angle sum of a triangle is 180°.
So, in an equilateral triangle, the measure of each angle is 60°.
3x = 60 + 12
3x = 72
x = 24
option (d)
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Answer:
(A)(12, 9)
Step-by-step explanation:
Given:
The beginning of the left edge of the stencil falls at (2, −1).
A point, say Q on the stencil is at (4, 1).
Point Q divides the stencil into the ratio 1:4.
We are required to find the end of the stencil.
Mathematically, Point Q divides the stencil internally in the ratio 1:4.
For internal division of a line with beginning point and end point
in the ratio m:n, we use the formula
,
, Q(x,y)=(4,1), m:n=1:4
Therefore:
The correct option is A.