One in my collection had been re- packaged (in polythene) in December 1976. Color: Yellow: Weight: 20 g: Manufacturer: Standardgraph: Categories: Writing Materials: State: New: EAN: 4014509013245: Evaluations 2. Feature: 4 360 Circular Protractor Calibrated inches. It remained in service long enough to acquire a NATO number W10 6675- 99- 445- 2112. Circular Protractor with 360 ° / 1 ° scale with opposite running numbers. These 360 protractors feature dual scales so you can measure angles with openings in either. The radius of a semi-circular plot is 21 m. Find the radius and circumference of a circle whose area is 144cm 2. Find the perimeter of semi-circular plate of radius 3.85 cm. The scales on one side, from top to bottom are: yards 1 inch = 1 mile yards 1/4 inch = 1 mile miles 1/4 inch = 1 mile yards 1:20,000 metres 1/4 inch = 1 mile metres 1 inch = 1 mile. Find the radius and the area of a circle if its circumference is 18 cm. The last ones made, including those made by Blundell Rules Ltd, were made of un- reinforced PVC and renamed Protractor Rectangular 6” Opaque ‘A’ Mk 4.
Later ivorine ones were not reinforced and the one pictured above is one of those. The earliest ones were reinforced in the ivorine with metal mesh and carried the patent number 361012/30 so it presumably replaced the AIII about 1930. Packages are returnable if all package items are returned, but individual items purchased as part of a package are returned, they may be refunded for less than the individual purchase price of that item, as they were purchased as part of a discounted package. Later protractors were transparent and semi- circular. Now let us find the perimeter of the semi. Now for a circle the diameter of the circle is twice the radius, which we can write as, d 2r. Complete step-by-step answer: Let us consider the radius of the semi circular protractor as r. The A Mk IV was the last, special design of British military rectangular protractor. Equate this perimeter of semi circular protractor to our given perimeter 108cm and find the diameter. Semi-circular protractor, two-way scale from 0 to 180, centring point, mm graduation base: 10 cm polystyrene 2110 - 0000 - clear 2110 - 0030 - smoke (fig.). Protractor Rectangular 6 inch Ivorine A Mk IV. Staedtler Semi-Circular Protractor-Staedtler Semi Circular Protractor Six Inch 180 degree protractor made of heavy duty crystal clear acrylic.