Nepal measures about 880 kilometers (547 mi) along its Himalayan axis by 150 to 250 kilometers (93 to 155 mi) across. It has an area of 147,516 km2 (56,956 sq mi).
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Okay so you can find the angle by working out the angle in the top right corner of the backwards 'Z' shape. Because there's 180 degrees in a straight line, that top right angle is 180 - 132 = 48.
Now we know that the top right angle is 48, so the angle you're looking for is 48, because they're alternate angles.
That means 3x + 9 = 48. You can find x by rearranging.
3x + 9 = 48
3x = 48 - 9
3x = 39
x = 13.
x is equal to 13.
