Answer:
12 inches
Step-by-step explanation:
Given


Required
Determine the height of the canvas
The question is illustrated using the attached image.
Using the attachment as a point of reference, the height is calculated from

This gives:

Make h the subject




A3^2+4=1604
a3=40
a2^2+4=40
a2=6
a1^2+4=6
a1=√2
So the first two terms are √2 and 6, answer C
Answer: I believe its Option 2
Step-by-step explanation: Sory if im wrong
Answer: 2. Linear pair postulate
4. 60 + mACB=180
5. mACB=120
6. definition of obtuse angle