Bài kiểm tra Toán học

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A triangle has side lengths of 3 cm, 4 cm, and 5 cm. What type of triangle is this?

• Equilateral

• Isosceles

• Right

• Obtuse

• 4ab

• 0

Which of the following numbers is a perfect square?

• 128

• 144

• 150

• 162

• $(x-3)(x+3)$

• $x(x-9)$

The sum of the interior angles of a convex polygon with n sides is given by which formula?

• 29

• 39

• 49

• 69

The area of a trapezoid is 48 cm². The lengths of the two parallel sides are 10 cm and 6 cm. What is the height of the trapezoid?

• 3 cm

• 6 cm

• 8 cm

• 12 cm

• $x=1$

• $x=5$

• $x=7$

• $x=8$

How many natural numbers n are there such that $n+1$ is a divisor of $2n+5$?

• 0

• 1

• 2

• 3