matimatika

What is the value of pi to two decimal places?

• 3.10

• 3.13

• 3.14

• 3.15

Answer explanation

The value of pi (π) is approximately 3.14 when rounded to two decimal places. Therefore, the correct answer is 3.14.

What is 7 multiplied by 8?

• 56

• 72

• 64

• 48

Answer explanation

7 multiplied by 8 equals 56. This is calculated by adding 7 to itself 8 times or using multiplication directly. Therefore, the correct answer is 56.

If x = 5, what is 2x + 3?

• 15

• 8

• 10

• 13

Answer explanation

To find 2x + 3 when x = 5, substitute 5 for x: 2(5) + 3 = 10 + 3 = 13. Therefore, the correct answer is 13.

What is the square root of 144?

• 10

• 12

• 14

• 16

Answer explanation

The square root of 144 is the number that, when multiplied by itself, equals 144. Since 12 x 12 = 144, the correct answer is 12.

What is 15% of 200?

• 40

• 50

• 30

• 25

Answer explanation

To find 15% of 200, multiply 200 by 0.15. This gives 200 * 0.15 = 30. Therefore, the correct answer is 30.

What is the formula for the area of a circle?

• A = 2πr

• A = πr²

• A = πd

• A = r²/2

Answer explanation

The area of a circle is calculated using the formula A = πr², where r is the radius. This formula derives from the relationship between the radius and the area, making it the correct choice among the options.

If a triangle has sides of length 3, 4, and 5, is it a right triangle?

• Yes, it is a right triangle.

• No, it is a scalene triangle.

• Yes, it is an equilateral triangle.

• No, it is an obtuse triangle.

Answer explanation

Yes, it is a right triangle because it satisfies the Pythagorean theorem: 3² + 4² = 5² (9 + 16 = 25). Thus, the triangle with sides 3, 4, and 5 is a right triangle.

What is the next prime number after 7?

• 15

• 11

• 13

• 9

Answer explanation

The next prime number after 7 is 11, as it is the smallest number greater than 7 that has no divisors other than 1 and itself. The other options (9, 13, 15) are either composite or not the immediate next prime.

What is the sum of the angles in a triangle?

• 90 degrees

• 360 degrees

• 45 degrees

• 180 degrees

Answer explanation

The sum of the angles in a triangle is always 180 degrees. This is a fundamental property of triangles in Euclidean geometry, making 180 degrees the correct answer.

What is 9 squared?

• 90

• 64

• 81

• 72

Answer explanation

9 squared means 9 multiplied by itself: 9 x 9 = 81. Therefore, the correct answer is 81.