It is 12 because there are 180 degrees in a set of supplementary angles and 12 times 10 equals 120, plus 60 equals 180.
Answer:
533.6cm²
Step-by-step explanation:
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<u>Area of each triangular base:</u>

<u />
<u>Area of the rectangular faces:</u>



<u>Add to find the surface area:</u>

Thus, the surface area of the triangular prism is = 533.6 yd²
Hope this helps you!
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Josh
12y+3x-24 you times everything in the bracket by 3
It means that the two line segments, EF and GH, are A, parallel.
The symbol between the segments (ll) is of two parallel lines, so it's stating that the segments are parallel.