Respuesta :

Use the Pythagoras theorum: a^2 + b^2 = c^2

Question 1:

15^2 = x^2 + 12^2

225 = x^2 + 144

x^2 = 225 - 144

x^2 = 81

Square root both sides to get x;

x = 9cm

Question 2:

3^2 + 4^2 = y^2

9 + 16 = y^2

y^2 = 25

Square root both sides to get y;

y = 5cm

Hope this helps!

(I haven't done question 3 and 4 because I can't see them in the image. Please type them in the comments so I can help you with them.)

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