Answer:
which number
Step-by-step explanation:
Answer:
It's Option A.
Step-by-step explanation:
Using the Cosine Rule:
cos < K = (3.9^2 - 1.9^2 - 2.8^2) / (-2 *1.9*2.8)
= 3.76 / -10.64
= - 0.3534.
m < K = 110.7 degrees.
Using the Sine Rule:
3.9 / sin 110.7 = 2.8 / sin <J
sin J = 2.8 sin 110.7/ 3.9 = 0.6716
m < J = 42.2 degrees
So m < L = 180 - (110.7 + 42.2)
= 180 - 152.9
= 27.1 degrees
Rectangle.
Explanation: Rectangles have four interior angles, all of which are right angles measuring 90 degrees each.
The first one can be proven by graphing the parallelogram and the diagonals.
The measure of angle 2 is 160 because it is a vertical angle to angle 1. The measure of angle 3 is 10 because the two other angles must each be 10 in order for the sum of all three angles to equal 180 for the triangles.
I have no idea for the third one however.
Hope this helps!