Do you (native speakers) say "Upon first appearance "- - No, not I. and "At first blush" -- Only when the situation is potentially embarrassing. I don't think that applies to congruent triangles.
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Mister MicawberDo you (native speakers) say "Upon first appearance"-- No, not I.OK.
Mister Micawberand "At first blush"-- Only when the situation is potentially embarrassing. I don't think that applies to congruent triangles.I never knew this and thanks.
Mister MicawberThere i