Step 1: Note down the given measurements

NOTE: Joker's cap in the form of cone

Radius = 3 cm

Height = 4 cm

Total Area of sheet = 1000 cm^2

Step 2: Determine the lateral surface area of one cone

Lateral surface area of cone = \pi r l

r - radius

l - slant height = \sqrt{r^2 + h^2}

l = \sqrt{3^2 + 4^2}

l = \sqrt{9 + 16}

l = \sqrt{25}

l = 5

Lateral surface area of cone = \pi r l

= \frac{22}{7} * 3 * 5

= 3.14 * 15

= 47.1\ cm^2

Step 4: Calculating the number of caps can be made from given sheet

Required area of sheet to make one joker's cap = 47.1 m^2

Area of given sheet = 1000 cm^2.

So, Number of caps can be made from that sheet = \frac{1000}{47.1}

= 21.231

Thus 21 caps can be manufactured from that paper sheet.