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1.041144203
2
cos-1
2.25 ÷ 6 = 67.9
68
ladder = not safe to use
3
Interior angle= 156°
Exterior angle = 180-156= 24°
No. of sides = 360/exterior angle
= 360/24
= 15sides
4
angle dea is 38
angle d and a is
180 - 38 = 142
142 / 2 = 71
180 - 71 = 109
5
square, rhombus
trapezium
rhombus
6
http://www.mrbartonmaths.com/resources/GCSE%20Revision/GCSE%20Maths%20Takeaway/4.%20Grades%20B%20to%20A-star/89.pdf
7
https://2fv5d843v9w22sxtto1ibxtu-wpengine.netdna-ssl.com/wp-content/uploads/2016/01/Algebra-F-Forming-Solving-Equations-v3-SOLUTIONS.pdf
8
interior angles = 180 - exterior angle
exterior angle = 360 / amount of sides
360 / 9 = 40 = exterior angle
180 - 40 = 140 = interior angles
TRAPEZIUM
angles add up to 360
140 + 140 = 280
360 - 280 = 80
80 / 2 = 40
trapezium angle + exterior angle = angle BEF
40 + 40 = 80
180 - 80 = 100
angle BEF = 100
9
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