Zadanie 1a
Find, in terms of r, (i) the arc length UV; (ii) hence the perimeter of the insert.
- Materiał graficzny
Connect radian angles with arc lengths and sector areas, retaining exact multiples of pi when appropriate.
Tę umiejętność sprawdza 36 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Find, in terms of r, (i) the arc length UV; (ii) hence the perimeter of the insert.
The insert has perimeter 20 cm. Find r.
The insert has perimeter 20 cm. Hence find the insert’s area.
Find θ.
Hence find r.
A circular filter of radius r cm has a concentric coated disk of radius 4 cm, with r>4. A wedge of angle π/4 is removed from the entire filter, including its coating. In the remaining filter the uncoated area is 5/2 times the coated area. Find r in the…
Find the area of fabric in the sector.
Find the radius of the open base.
In the spherical model the world has radius 5000 km. Coordinates are in thousands of kilometres, with origin at its centre. The north pole P and station N have vectors and . The positive x direction points west…
In the spherical model the world has radius 5000 km. Coordinates are in thousands of kilometres, with origin at its centre. The north pole P and station N have vectors and . The positive x direction points west…
In the spherical model the world has radius 5000 km. Coordinates are in thousands of kilometres, with origin at its centre. The north pole P and station N have vectors and . The positive x direction points west…
A circle has centre O. Points A and B subtend a minor central angle of 2.2 radians. Triangle AOB has area 18 cm2. Point C is on the major arc from A to B. Find the length of arc ACB.
A circular window is divided by chord AB. Its minor segment P has area 18 cm2. The triangle OAB, labelled Q, and segment P have areas in the ratio P : Q = 2 : 3. The circle has centre O, radius r cm, and with 0 < θ < π.…
Find (i) θ; (ii) r.
Find the total shaded area.
Show that r = 24π/(2 + θ).
Find θ.
Show that r2 − 7r + 12 = 0.
Find r and θ.
Show that the angular speed is π/9 radians per second.
Find T.
Express α in terms of t.
Find r.
Hence find the sector perimeter.
Find the perimeter of the annular sector.
Find θ.
Find the area.
Show that θ=2.20 radians, to three significant figures.
Find the cross-sectional area.
Show that the combined area is (π − 0.4)(144 − r2).
(i) Find r. (ii) Find the total boundary length of both pieces, including every radial end.
Show that the combined area is (π − 0.4)(144 − r2).
(i) Find r. (ii) Find the total boundary length of both pieces, including every radial end.
Find the area of the major sector between OA and OB.
Express the area of one hole in terms of θ.
The remaining plate has area 25π − 9 cm². Find θ.
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