Explanation

A surd is an irrational number or expression containing a square root, cube root, etc., that can't be simplified to a rational number.

Example: √2, ³√5 are surds because they involve radical signs.

Explanation

An angle inscribed in a semicircle is always 90° due to the Thales' Theorem.

It is called a right angle because the angle subtended by a diameter is always right.

Explanation

A Pie Chart is ideal for showing the proportional contribution of each income source to the total income.

It visually displays how a whole is divided into parts, making comparisons easy.

Explanation

The phrase "run out of" is a common English expression meaning to have no more of something.

So, "We have run out of groceries and provisions" is grammatically and idiomatically correct.

Explanation

"Across the road" correctly indicates movement from one side of the road to the other.

It fits the context of safety and direction before crossing.

Explanation

Explanation

Inquiry-Based Science Teaching is rooted in the Constructivist approach, where students actively build their own understanding through questioning, exploring, and experimenting.

It encourages hands-on learning and critical thinking rather than passive memorization.

Explanation

1 + tan²θ = Sec²θ

This is a fundamental trigonometric identity.

Explanation

The model shown (– – – → + +) suggests starting with a negative and ending with a positive result.

–2 + 3 = 1, which matches that transition from negative to positive.

Explanation

The initial population is 2¹⁶ insects.

If the population doubles, the new population will be 2 * 2¹⁶ = 2¹⁷.