Question

11) MZHGF = 16x + 4, m EGF = 110°,

and MZHGE = 3x + 11. Find x.
G
H
F
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Answer 1

Answer: x = 9

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Step-by-step explanation:

The smaller angles HGE and EGF combine to form the largest angle HGF.

This is an example of the angle addition postulate.

(angle HGE) + (angle EGF) = angle HGF

(3x+11) + (110) = 16x+4

3x+121 = 16x+4

121-4 = 16x-3x

117 = 13x

13x = 117

x = 117/13

x = 9 which is the final answer

We can stop here.

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Extra info (optional section)

Use this x value to find each angle shown below

• angle HGE = 3x+11 = 3*9+11 = 27+11 = 38 degrees
• angle HGF = 16x+4 = 16*9+4 = 144+4 = 148 degrees

Then notice how,

(angle HGE)+(angle EGF) = 38+110 = 148

which is exactly the measure of angle HGF

This confirms that the equation

(angle HGE) + (angle EGF) = angle HGF

is true for that x value of x = 9. Therefore, the answer is confirmed.

Answer 2

9514 1404 393

Answer:

11) x = 9°

13) x = -12°

Step-by-step explanation:

11) ∠HGE +∠EGF = ∠HGF

(3x +11) +(110°) = (16x +4)

117° = 13x . . . . . . . . . . . . . . . subtract 3x+4, collect terms

9° = x . . . . . . . . . . . . divide by 13

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13) ∠BCF +∠FCD = ∠BCD

(x +78) +(x +41) = 95°

2x = -24°

x = -12°