This is a polygon. I can’t find the missing angle ?
1 answer:
This is a lot of calculation. So we know that the sum of angles for any heptagon is 900, because heptagon can be divided into five non-overlapping triangles and sum of angles of each triangle is 180. Now you just add up all angles and simplify the equation: 900 = (6x - 8) + 120 + (7x - 64) + (5x - 4) + 135 + (3x + 31) + (4x + 15) 900 = <span>25x + 225 Now it's just regular algebra equation. You can solve for x: 675 = 25x x = </span>27 So the value of x is 27
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5 cm = 2km
Scale= 5 cm : 200000 cm
= 1 : 40000
a. 1 : 40000 = x : 500000
x = 12.5 cm
b.1 : 40000 = 2 : x
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