protractor

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As if she had a protractor in her head, she also sees precise angles.
如同她的腦袋裡長(zhǎng)著一個(gè)量角器，她同樣能讀出準(zhǔn)確的角度。
It also has a printed protractor to cut sandwiches at perfect angles.
它上麪還有一個(gè)畫(huà)好的量角器，這樣可以讓你把三明治切出一個(gè)精確的角度。
As if she had a protractor in her head, she also sees precise angles. “When I draw a piece of equipment, I can test run it in my mind.”
如同她的腦袋裡長(zhǎng)著一個(gè)量角器，她同樣能讀出準(zhǔn)確的角度?！皟}我在腦袋裡畫(huà)一部?jī)x器，我能在腦海裡給它測(cè)試運(yùn)行。”

He fashioned abstract, collagist portraits using sandpaper, nails, feathers, hatpins, corks and even a protractor: a mixture of elegance and sadism.
FORBES: Magazine Article
Other important measurement tools include the ruler, the protractor, the tape measure.
FORBES: Magazine Article
It was, arguably, an analog computer, in that it housed pencils, pens, a calculator, ruler, protractor and a folder for each of one's classes.
ENGADGET: This is the Modem World: An ode to the trapper keeper

a device used for measuring and drawing angles. It is usually in the form of half a circle made from transparent plastic with degrees printed on it.

A protractor is a flat, semicircular piece of plastic or metal that is used for measuring angles.