The best way to prepare for exams is to go through past year examples. You should thoroughly read, discuss solutions, and understand the exercises completely.
For psychoanalytical exams, there are additional points you should consider:
The sum of angles in a triangle is always 180 degrees.

Since we know that the angles of the triangle add up to 180 degrees, we can work out what x is:
"So angles in a triangle always add up to 180 degrees?" Miley asked.
"Yep," Jeremy responded.
"Always???" Miley wanted to confirm.
"Always," Jeremy said, "just like your never-ending love of me <3"
]]>Exterior angles can be calculated with the knowledge that angles on a line add up to 180 degrees.

Since we know that angles in a triangle add up to 180 degrees, we can calculate x as:

More complex examples

(exterior angle of a triangle)
Another example:

(angles of a triangle)
Another example:

Another example:

A triangle with 3 sides that are equal are called equilateral triangle, symbolized as:
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A triangle with 2 sides that are equal are called an isosceles triangle, symbolized as:
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"Hey Jeremy, you squished the triangle!" Miley said.
"That's the point," Jeremy replied, "2 sides are still the same, but 1 is not anymore!"
"I still think it was mean Q(" Miley commented.
A triangle with no sides that are equal are called a scalene triangle, symbolized as:
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Triangles with right angles are called right-angled triangles, symbolized as:
![]()
Triangles with 3 angles that are acute (below 90 degrees) are called acute triangles, symbolized as:
![]()
Triangles with 1 angle that is obtuse (larger than 90 degrees) are called obtuse triangles, symbolized as:
![]()
Remember from year 7 the principles of:
In addition, you should be aware of co-interior angles. For example, in the angles:

Examples of co-interior angles are d and f, which add up to .
Area of a rectangle can be calculated by
For example, for this triangle:

Applying the formula:

If the triangle is not a right angle you can still find out the half of the triangle, with the same formula above, Area of triangle = 1/2 * (base * height)

For this triangle, applying the formula, it is:

"There we go ;)," Miley said.
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