Answer:
Step-by-step explanation:
b, i'm not sure but thats what i think.
Answer:
The 3D figure formed is a <u>Cuboid</u><u>.</u>
A part, share, or number in relative comparison to the whole. To be proportional means they are equal parts of the whole. In math, it would mean the same thing. A proportion is the named given to a statement where two ratios are equal.
Answer:
Step-by-step explanation:
We are to show that 
<u>Proof:</u>
From trigonometry identity;


From trigonometry, 2sinAcosA = Sin2A

Also note that sin(B-C) = sinBcosC - cosBsinC
sin420cos140 - cos420sin140 = sin(420-140)
The resulting equation becomes;

= 
The x coordinate stays the same but y coordinate changes sign so it will be a reflection in the x-axis.