Eruvin5: 3
וְכֵן שְׁלֹשָׁה כְפָרִים הַמְשֻׁלָּשִׁין, אִם יֵשׁ בֵּין שְׁנַיִם הַחִיצוֹנִים מֵאָה וְאַרְבָּעִים וְאֶחָד וּשְׁלִישׁ, עָשָׂה אֶמְצָעִי אֶת שְׁלָשְׁתָּן לִהְיוֹתָן כְּאֶחָד.
Similarly, three villages forming a triangle, if there are one hundred forty-one and a third [cubits] between the two outer ones, the middle one causes all three of them to become as one.
Berachos5: 4
הָעוֹבֵר לִפְנֵי הַתֵּבָה — לֹא יַעֲנֶה אַחַר הַכֹּהֲנִים אָמֵן, מִפְּנֵי הַטֵּרוּף. וְאִם אֵין שָׁם כֹּהֵן אֶלָּא הוּא — לֹא יִשָּׂא אֶת כַּפָּיו. וְאִם הַבְטָחָתוֹ שֶׁהוּא נוֹשֵׂא אֶת כַּפָּיו וְחוֹזֵר לִתְפִלָּתוֹ — רַשַּׁאי.
The one who passes before the ark should not respond ‘‘Amen’’ after the [blessings of the] Kohanim because of the [risk of] confusion. And if there is no Kohen there except him, he should not lift up his hands. But if he is confident that he can lift up his hands and resume his prayer, he is permitted [to do so].