A pentagon is pictured below, where one internal angle is a right angle.
What is the value of `x`? (3 marks)
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`y^{\circ}=180-100 = 80^{\circ}\ \ \text{(180° in straight line)}`
`text{Sum of exterior angles = 360°}`
| `z^{\circ}` | `=360-(70+70+90+80)` | |
| `=360-310` | ||
| `=50^{\circ}` |
`:.x^{\circ}=180-50 = 130^{\circ}\ \ \text{(180° in straight line)}`