HKDSE-MATH

2021-II-17

Ans: B

I is true. Let $r cm$ be the radius of the sector

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2021

2021-II-18

Ans: B

In $Δ C D E$ ,

$\begin{array}{rcll}
\angle CED &#

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2021-II-19

Ans: D

I is true. Since $A B C D$ is a rectangle, then $AB\text{

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2021

2021-II-20

Ans: C

Since $Δ E B F \sim Δ D A E$ , then we have

$\beg

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2021-II-21

Ans: D

I is true.

$\begin{array}{rcl}
\angle ABC & = &#

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2021-II-22

Ans: A

$\begin{array}{rcll}
\angle ACD & = & 180

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2021-II-23

Ans: B

$P (7, - 5)$ is reflected with respect to the $y$ -axis t

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2021-II-24

Ans: D

In $Δ A C D$ ,

$\begin{array}{rcll}
\tan \theta &

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2021-II-25

Ans: C

Let $(x, y)$ be the coordinates of $P$ . Then the equati

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2021

2021-II-26

Ans: A

Since $A P$ is a median of $Δ A B C$ , then $P$ is the m

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2021

2021-II-27

Ans: C

Let $C$ be the centre of the circle. Then the coordinat

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2021-II-28

Ans: D

Note that there are $24$ workers. Then the lower quart

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2021-II-29

Ans: B

The inter-quartile range

$\begin{array}{cl}
=

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2021-II-30

Ans: A

Let $μ$ be the mean of the remaining $40$ integers.

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2021-II-31

Ans: A

$\begin{array}{rcl}
\text{The $1$ st expression} &

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2021-II-32

Ans: D

$\begin{array}{cl}
& 14\times 16^{15} +17 \ti

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2021-II-33

Ans: C

Sub. $y = 0$ into $y = a + \log_{b} x$ , we have

$\begin{arra

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2021-II-34

Ans: C

Consider the equation of the straight line, we have

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2021

2021-II-35

Ans: A

I must be true. For any real number $α$ ,

$\begin{

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2021

2021-II-36

Ans: A

I must be true. Since $p$ , $q$ , $r$ and $s$ is a geometri

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2021