Answer:
2
Step-by-step explanation:
(x+10)/4 = 9/3
(x+10)/4 = 3
x+10 = 12
=> x = 2
These are right triangles. Rectangular triangles are those that have a right angle of 90°.
⇔ EF/BC = 9/3
⇔ (x+10)/4 = 9/3
⇔ (x+10)/4 = 3.
⇔ (x+10) = 3 • 4
⇔ x+10= 12
⇔ x = 12 - 10
⇔ x = 2.
