Question 1. Find the surface area of the square pyramid below.
2 answers:
Answer:
see explanation
Step-by-step explanation:
(1)
SA = area of square base + area of 4 congruent triangular faces
= (3.5 × 3.5) + (4 × × 3.5 × 10 )
= 12.25 + 70
= 82.25 in²
(2)
SA = area of circular base + area of curved surface
[ area of curved surface = πrs, r is the radius and s the slant height ]
SA = π × 2² + π × 2 × 6 = 4π + 12π = 16π ≈ 50.27 m²
(3)
SA = area of circular base + area of curved surface
[ note diameter = 19, hence r = 9.5 ]
SA = π × 9.5² + π × 9.5 × 17 = 90.25π + 161.5π = 251.75π ≈ 790.90 cm²
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Answer:
Option (3). 120° will be the answer.
Step-by-step explanation:
By using the theorem of secants intersecting externally,
Measure of angle formed by two secants, from a point outside the circle is half the difference of the measures of the intercepted arcs.
m∠C =
36° =
72° = °
= 72 + 48
= 120°
Therefore, Option (3) is the answer.