Grade 9 Math: Intro to Geometry Pythagorean Theorem

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True
False

What is the one condition of a Pythagorean theorem?

It can only be used on a isosceles triangle
It can only be used on a right-angled triangle
It can only be used on a scalene triangle
It can only be used on a equilateral triangle

We have a triangle with the following measurements: $$a=3$$ and $$b=9$$. What is the value of the hypotenuse?

$$\sqrt{45}$$
$$\sqrt{60}$$
$$\sqrt{30}$$
$$\sqrt{90}$$

12km
18km
22km
24km