(a) What kind of numbers do you get if you add consecutive triangular numbers? Give examples.
(b) $∠ E$ is a complement of $∠ F$ and $∠ E$ = $28^{\circ}$ . Find $∠ F$ .
[2 MARKS]

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Solution

Each part: 1 Mark

(a) By adding consecutive triangular numbers, we get square numbers.
e.g. 1 + 3 = 4, 6 + 10 = 16, etc.

(b) $∠ F = 90^{\circ} - 28^{\circ}$
$= 62^{\circ}$

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(a) What kind of numbers do you get if you add consecutive triangular numbers? Give examples. (b) ∠E is a complement of ∠F and ∠E= 28∘. Find ∠F. [2 MARKS]

Each part: 1 Mark (a) By adding consecutive triangular numbers, we get square numbers. e.g. 1 + 3 = 4, 6 + 10 = 16, etc. (b) ∠F=90∘−28∘ =62∘

(a) What kind of numbers do you get if you add consecutive triangular numbers? Give examples.
(b) $∠ E$ is a complement of $∠ F$ and $∠ E$ = $28^{\circ}$ . Find $∠ F$ .
[2 MARKS]

Each part: 1 Mark

(a) By adding consecutive triangular numbers, we get square numbers.
e.g. 1 + 3 = 4, 6 + 10 = 16, etc.

(b) $∠ F = 90^{\circ} - 28^{\circ}$
$= 62^{\circ}$